%YAML 1.2
---
!!seq [
  !!seq [
    !!map {
      ? !!str "YAML"
      : !!str "separate"
    },
  ],
  !!seq [
    !!map {
      ? !!null ""
      : !!str "empty key entry"
    },
  ],
  !!seq [
    !!map {
      ? !!map {
        ? !!str "JSON"
        : !!str "like"
      } : "adjacent",
    },
  ],
]
